Synthesis and Structure of Paramagnetic β-OctamolybdateComplex,[Fe（2,2′-bipy）3]2[Mo8O26]·6H2O
摘要
A novel octamolybdate complex, [Fe(2,2′-bipy)3]2[Mo8O26]·6H2O has been synthesized via the hydrothermal technique, and it crystallizes in monoclinic, space group P21/c with two molecules in a unit cell:α=1.21512(5), b=1.36840(5), c=2.18823(9)nm,β=90.515(1)°, Mr=2340.42, Z=2, V=3.6384(2)nm^3, Dc=2.136 g/cm^3, F(000)=2296, λ(MoKα)=0.071073nm,μ=1.813mm^-1, R=0.0719 and ωR=0.1093 for 4058 observed reflections with I≥2σ(I). The structure is characterized by the co-existence of octahedral [Fe(2,2′-bipy)3]2+ cations and β-octamolybdate [Mo8O26]^4- anions. The magnetic susceptibility data show a Curie-Weiss paramagnetic behavior (θ=-5.201 K) in accordance with the spin-only ground state of Fe^Ⅱ ions. IR, UV-Vis, and EPR spectra are also briefly noted in this paper.